C11 and C12 in fuel check
 

We have occasionally had problems with C11 passing fuel check. Thinking of switching to C12. Is C12 better for passing fuel check? What are your experiences?

Re: C11 and C12 in fuel check
 

Marty,
the only problems I have had with C-11 is if I leave in the cell or a plastic fuel jug...
I have kept stored in barrel or VP can for up to 2 years no problem, but fuel left in cell or plastic jug,just one week between races won't pass

Re: C11 and C12 in fuel check
 

My C12 has never failed (usually buy by the pail and unsealed pails are kept in temperature controlled garage). C11 fails in the past likely linked to conditions referenced by Mike.

Re: C11 and C12 in fuel check
 

There again fuel check is as good as the guy doing the checking no disrespect in anyway, ,those guys are out in the heat just like everybody else. If you fail ask if you can get another sample be polite and ask if its low and by how much. I had a number of the guy from Vp to call if there is a problem. More to come later Tom

Re: C11 and C12 in fuel check
 

Ditto on storing C 11 only in Metal sealed containers. No issues once I switched from Plastic.

Steve Teeter STK/SS 620

Re: C11 and C12 in fuel check
 

Don`t know how much heat, humidity, etc effects the sample, but I have had C12 from a 2 year old drum pass no problem, yet several years ago, I bought 10 gallons of C12 from the VP truck at Seattle, and the following weekend, at fuel check at Sonoma, the guy doing the testing, said that the fuel I had bought one week prior, was borderline. I have to think the drums of fuel taken to the National Events, should be pretty fresh. Go figure.

Re: C11 and C12 in fuel check
 

I have never had C-12 fail fuel check even if it was left in the cell for several months. I did run C-11 for a time but didnt have a good source for it. I also tried Sunoco but always seemed to have difficulties at fuel check with the Sunoco Blue fuel. I didn't see any difference between C-12 and C-11 except in my wallet.

Re: C11 and C12 in fuel check
 

Marty: We've never had a problem with C-12 in fuel check. We've been purchasing it in 5-gallon cans for several years directly from a VP dealer.

Re: C11 and C12 in fuel check
 

I have bought C11 in a 5 gallon can and have been bounced
a couple times the next week. The C12 - never an issue!

Re: C11 and C12 in fuel check
 

Marty my brother have had problems with C11. When we fail fuel check we went back to pits and dumped fuel and replaced with fresh C11 only to fail again. Tech guy asked, "did you replace the fuel cell foam".....uh no we didn't. Go back dump the fuel and remove the fuel cell foam and then we passed.
We permanently switched to C12 only to pass fuel check. Since then we have used C12 in pails and C12 from underground tank with no failures.
Ray

Re: C11 and C12 in fuel check
 

Failed twice at Epping Nationals. Had run out of C-10 and used track sunoco. Brought 5 Gal can and it tested OK. Problem was fuel cell Foam. Removed it and no further problems. If you have foam in the cell it will hold the previous bad fuel!! No foam for ME!!!

Re: C11 and C12 in fuel check
 

Just a clarification. It must be a safety risk to run a fuel cell without foam.

You just can not get all the "failed" gas out of the foam when you dump the "bad" fuel so the "good" fuel is mixed with the "bad" fuel and you might fail again.

We finished that race without foam and replaced it for the next race.
Ray

Re: C11 and C12 in fuel check
 

First time running stock this year, what happens when you fail fuel check and when do they do it?

Re: C11 and C12 in fuel check
 

Fuel cell foam is not required. It is designed to slow down sloshing when braking or turning. Also you may find that "plastic" fuel cells will also cause a fuel to fail.

Re: C11 and C12 in fuel check
 

They usually check first or second qualifier and any heads up race. Also could be random times. If you fail in qualifying, your run gets thrown out. If you fail in eliminations, you get bounced.

Re: C11 and C12 in fuel check
 

Every time I had my fuel checked (C11) at Sonoma they told me it was borderline but never had that issue at Vegas. I'm sure it was the same tech guys, maybe it was the altitude.